Mitsubishi Electric FR-A800 Series Instruction Manual page 82

 Starting and stopping the 24 V external power supply operation
• Supplying 24 V external power while the main circuit power is OFF starts the 24 V external power supply operation.
Likewise, turning OFF the main circuit power while supplying 24 V external power starts the 24 V external power supply
operation.
• Turning ON the main circuit power stops the 24 V external power supply operation and enables the normal operation.
NOTE
• When the 24 V external power is supplied while the main circuit power supply is OFF, the inverter operation is disabled.
• In the initial setting, when the main circuit power supply is turned ON during the 24 V external power supply operation, a reset
is performed in the inverter, then the power supply changes to the main circuit power supply. (The reset can be disabled using
Pr.30. (Refer to
 Confirming the 24 V external power supply input
• During the 24 V external power supply operation, "EV" blinks on the operation panel. The alarm lamp also blinks. Thus,
the 24 V external power supply operation can be confirmed even when the operation panel is removed.
Blinking
• During 24 V external power supply operation, the 24 V external power supply operation (EV) signal is output. To use the
EV signal, set "68 (positive logic) or 168 (negative logic)" in one of Pr.190 to Pr.196 (Output terminal function selection)
to assign function to an output terminal.
 Operation while the 24 V external power is supplied
• Fault history and parameters can be read and parameters can be written (when the parameter write from the operation
panel is enabled) using the operation panel keys.
• The safety stop function is invalid during the 24 V external power supply operation.
• During the 24 V external power supply operation, the monitor items and signals related to inputs to main circuit power
supply, such as the output current, converter output voltage, and IPF signal, are invalid.
• The alarms, which have occurred when the main circuit power supply is ON, continue to be output after the power supply
is changed to the 24 V external power supply. Perform the inverter reset or turn OFF then ON the power to reset the faults.
• If the power supply changes from the main circuit power supply to the 24 V external power supply while measuring the
main circuit capacitor's life, the measurement completes after the power supply changes back to the main circuit power
supply (Pr.259 = "3").
• The output data is retained when "1 or 11" is set in Pr.495 Remote output selection.
NOTE
• Inrush current equal to or higher than the 24 V external power supply specification may flow at power-ON. Confirm that the
power supply and other devices are not affected by the inrush current and the voltage drop caused by it. Depending on the
power supply, the overcurrent protection may be activated to disable the power supply. Select the power supply and capacity
carefully.
• When the wiring length between the external power supply and the inverter is long, the voltage often drops. Select the
appropriate wiring size and length to keep the voltage in the rated input voltage range.
• In a serial connection of several inverters, the current increases when it flows through the inverter wiring near the power supply.
The increase of the current causes voltage to drop further. When connecting different inverters to different power supplies, use
the inverters after confirming that the input voltage of each inverter is within the rated input voltage range. Depending on the
power supply, the overcurrent protection may be activated to disable the power supply. Select the power supply and capacity
carefully.
• "E.SAF" or "E.P24" may appear when the start-up time of the 24 V power supply is too long (less than 1.5 V/s) in the 24 V
external power supply operation.
• "E.P24" may appear when the 24 V external power supply input voltage is low. Check the external power supply input.
• Do not touch the control circuit terminal block (circuit board) during the 24 V power supply operation (when conducted).
Otherwise you may get an electric shock or burn.
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2. INSTALLATION AND WIRING
2.6 Control circuit
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